基于零空间的网络编码云存储完整性校验方案

Data integrity check based on null space for network coding based cloud storage

基于网络编码云存储的数据完整性校验过程,面临着验证过程中计算开销较大、安全性弱等问题。为解决这些问题,该文提出了基于零空间的网络编码云存储数据完整性校验方案——NS-NCCS。该方案首先计算出原始信息的零空间,利用零空间生成验证向量,并将验证向量发送给独立的第3方验证节点完成数据验证。分析与计算结果表明:与NC-Audit方案相比,该方案在完整性验证过程中可以显著降低漏检率、有效防止验证节点反推出原始信息、节省计算开销以及有效支持数据修复。

The process of data integrity check for network coding based cloud storage has problems of poor safety and large computational overhead. A scheme of data integrity check was developed based on null space for network coding based cloud storage （NS-NCCS） to solve these problems. In the scheme, the null space of original information is calculated and used to generate the integrity verification vector which is then sent to an independent third-party verification node for data integrity validation. Analyses and simulations show that compared with NC-Audit, NS-NCCS significantly decreases the omission factor during the data integrity checking and effectively prevents the original information disclosure in the process of verification, with the computational overhead reduced and data repair supported.